2011年1月4日 · An assignment statement always has a single variable on the left hand side of the = sign. The value of the expression on the right hand side of the = sign (which can contain math operators and other variables) is copied into the memory location of the variable on the left hand side. Figure 1: Assignment Statement (variable = expression) ¶

2011年1月4日 · Figure 1: Assignment Statement (variable = expression;) ¶ Instead of saying equals for the = in an assignment statement, say “gets” or “is assigned” to remember that the variable gets or is assigned the value on the right. In the figure above score is assigned the value of the expression 10 times points (which is another variable) plus 5.

The assignment statement changes the value (the object) that bruce refers to. Here is what reassignment looks like in a reference diagram: It is important to note that in mathematics, a statement of equality is always true. If a is equal to b now, then a will always equal to b. In Python, an assignment statement can make two variables refer to ...

A statement is an instruction that the Python interpreter can execute. We have only seen the assignment statement so far. We have only seen the assignment statement so far. Some other kinds of statements that we’ll see shortly are while statements, for statements, if statements, and import statements.

Compound Assignment Operators¶ Compound assignment operators are shortcuts that do a math operation and assignment in one step. For example, x += 1 adds 1 to the current value of x and assigns the result back to x. It is the same as x = x + 1. This pattern is possible with any operator put in front of the = sign, as seen below.

Tuple Assignment¶ One of the unique syntactic features of Python is the ability to have a tuple on the left side of an assignment statement. This allows you to assign more than one variable at a time when the left side is a sequence.

An assignment statement uses a single = symbol. For example, x = 3 assigns the value of 3 to the variable x. On the other hand, an equality statement uses two = symbols. For example, x == 3 is a boolean that evaluates to true if x is equal to 3 and evaluates to false otherwise.

The expression is the right-hand-side (RHS) of an assignment statement, and for this problem we want the expression to determine whether or not the restaurant cost is affordable. To determine this we will need to mathematically calculate the total cost of the bill with the tip and then determine if it is no greater than the limit provided ($150).

This example shows three assignments, and the comments show three different ways people sometimes talk about assignment statements. The vocabulary can be confusing here, but the idea is straightforward: When you declare a variable, you create a named storage location. When you make an assignment to a variable, you give it a value.

statement¶ An instruction that the Python interpreter can execute. So far we have only seen the assignment statement, but we will soon meet the import statement and the for statement. str¶ A Python data type that holds a string of characters. type conversion function¶ A function that can convert a data value from one type to another. value¶